By Paul Vieira 

OTTAWA--Canada's Conservative government unveiled a series of family-focused tax breaks Thursday, signaling its plans to follow through on a pledge to share some of next year's expected federal budget surplus.

Canada will offer tax-relief measures totaling 26.76 billion Canadian dollars ($23.97 billion) over a six-year period ending in March 2020. The most high-profile of the measures is income splitting, in which a higher-income spouse would be eligible transfer up to C$50,000 of taxable income to a spouse in a lower income-tax bracket. The transfer could net the couple a tax savings of up to C$2,000 in a given year.

The move on income splitting fulfills a promise that Prime Minister Stephen Harper made during the 2011 election campaign. Next year, Mr. Harper likely will be seeking a fourth straight mandate, which would make him one of the longest-serving leaders in Canadian history.

The measures still require a vote in Canada's legislature, but passage is assured as the ruling Conservatives hold a majority of seats in both the lower and upper houses of the Parliament.

Mr. Harper signaled earlier this month that his government would move quickly to implement tax-relief measures, after reporting a much narrower-than-anticipated deficit in the 2013-14 fiscal year. Mr. Harper has forecast a smaller deficit for this fiscal year, although the country's budget watchdog and economists at Toronto-Dominion Bank say Ottawa is on track for a surplus ranging from C$3.6 billion to C$5 billion.

Mr. Harper and his governing Conservatives, who have been trailing in the polls for more than a year to the opposition Liberal Party, are trying to capitalize on the coming budget surplus ahead of the next election, which must be held no later than October 2015.

In the coming 12-month period, Mr. Harper is likely to portray his administration as offering a steady hand on economic policy levers, given that Canada emerged relatively unscathed from the global financial crisis and subsequent recession, and still managed to rein in the large deficit it accumulated during the downtown. The federal deficit reached a peak of C$55.60 billion in 2010 as tax revenue fell and the government pursued a large stimulus program to spark the country's economy.

Mr. Harper also is attempting to position his government as a strong voice on foreign affairs and a fierce advocate in combating terror, especially in light of two attacks this month that killed two soldiers and led to a gunman storming the country's Parliament.

Write to Paul Vieira at paul.vieira@wsj.com